Evaluation And Test - Analog Devices UG-435 User Manual

Evaluation Board User Guide

EVALUATION AND TEST

To evaluate and test the performance of the ADF4351, use the
following procedure:
1. Install ADF435x software.
2. Connect the evaluation board to a PC using the supplied
USB cable. Follow the hardware driver installation
procedure that appears.
3. Connect spectrum analyzer to Connector RF
4. Connect 50 Ω termination to RF
5. Run the ADF435x software.
6. Select the USB board and the
Select Device and Connection tab of the software front
panel window.
7. In the software window, click Write All Registers. See
Figure 19 for the suggested setup.
8. Measure the output spectrum. Figure 20 shows a
phase noise plot at 2.5 GHz output.
9. Different combinations of reference and PFD frequency
may require changes to the REFIN stage or PFD frequency.
Low output frequencies may require different output stage
elements.
PC
A+.
OUT
A−.
OUT
ADF4351 device in the
USB
POWER
LED
USB CRYSTAL
AND PROCESSOR
LOCK DETECT LED
EXTERNAL
EXTERNAL DC
POWER
SUPPLY
SWITCH
USB
EXTERNAL DC
POWER
GND
POWER
SWITCH
Figure 21. Typical Evaluation Setup
REFERENCE IN/
REFERENCE OUT
TCXO
ADF4351
LOOP
FILTER
PLL
LED
50Ω
TERMINATION
Rev. 0 | Page 11 of 20
Figure 20. Spectrum Analyzer Display
REFERENCE (OPTIONAL)
SPECTRUM
ANALYZER
UG-435